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Saved by King Regis as a child, Nyx repays the debt by serving the Kingsglaive with distinction. His unique ability to wield the King's magic and epic exploits in combat have earned him the moniker of 'hero' among his peers.

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Concept art shown at The Magic of Kingsglaive and Final Fantasy XV art exhibit in New York from August 19 to September 3, 2016.

Nyx is a young man with dark gray hair and blue eyes. He wears the black uniform typical of his fellow Glaives, but his is customized with a silver antler or horn on its hood, purple ribbons on its back, and pelts of blue-gray fur on its left sleeve. According to the The Art and Design of FINAL FANTASY XV book, the ornament indicates his heritage as a member of an ancient lineage of hunters, and posits that it adds credibility to his role as a royal guard.

Nyx's signature weapon is his pair of kukris, one originating from Galahd and the other having been forged in Insomnia, symbolizing both of his homelands.

Nyx has small and subtle tattoos. He has a "crow's foot" on his right cheek, and a line and a dot under his left eye. He has markings on his ears, a line down his neck, one around his right leg and a line down his middle finger of his left hand, and another down his forefinger on his right hand.

Nyx appears with a large feline in some illustrations. It is a Galahd-native coeurl and Nyx's image-motif. Horns and fur on his gear symbolize him being wild and also foreign, as he is an immigrant from Galahd in thus from a different culture compared to Insomnia. His theme color is blue to complement Regis, whose purple theme reflects his nobility and maturity. To show Nyx's youth and to make it in line with Regis's purple, blue was chosen to be Nyx's color.[2]

To hell with your power. I’m not here for it. I only came to tell you, you are no kings.

—Nyx to the Lucii

Nyx is a heroic individual who feels indebted to King Regis. He is confident in his abilities, but is haunted by the memory of his sister's death, which can cause him to have flashbacks during battles whenever his friends are in danger of not being able to save her. This is why he does all in his power to save his comrades, who call him by the moniker "hero" from his exploits. When his comrades betray him, Nyx remains loyal to the Lucian royal family, as well as his best friend Libertus and Lady Lunafreya; when Insomnia falls, he hangs onto hope and resolves to fight for the future thanks to Lunafreya's encouragement about Nyx's sister wanting him to see a brighter future.

Nyx is selfless, as he refuses to choose between Libertus or Lunafreya when requesting the power from the Ring of the Lucii. Nyx elects to instead sacrifice his own life to the past Lucian kings' spirits, who grant the ring's power to those they deem worthy. Nyx bargains with them knowing that the price for using the ring's powers for those not of the Lucian royal blood is a life. Unlike his former mentor and superior, Titus Drautos, who was also General Glauca, Nyx can move on from his past to fight to help give the world a future, something that would not happen if Niflheim claimed the Ring of the Lucii instead of Prince Noctis. As a result, he was no longer fighting to protect Insomnia and did not care what happened to the city as long as he kept the Ring of Lucii away from the empire's hands.

Although he is selfless, it can be interpreted as arrogance, which leads to the old kings initially judging him as unworthy. Even when he proves his worth, Nyx gloats, saying the kings would lose their "precious ring" if they burn him.

Nyx is a skilled wielder of the Lucian royal family's powers. He favors his ability to warp, which he does by throwing his kukris, as even though he is adept in close-range combat, the kukris offer him more range when thrown. He also uses various other types of magic, such as projecting fire and lightning from the palm of his hand, and the ability to project magical shields. When deemed worthy of the Ring of the Lucii, he becomes even more powerful and gains the ability to control the Old Wall.

Native son of Galahd who fought alongside the local Resistance before arriving in Insomnia to serve Regis in the Kingsglaive. His affinity for the royal magic and his epic exploits in combat have earned him the moniker of "hero" among his peers. Tasked by his king to see the Lady Lunafreya and the Ring of the Lucii to safety, a dire situation forced the Glaive hero to don the ring himself and channel its power at the cost of his life.

Nyx grew up alongside Libertus Ostium in Galahd where they used to play as children in the Galahd River. Nyx and Libertus later ran a small bar in their hometown. The area used to be protected by the Wall, but thirty years ago war overtook the lands and Wall crumbled, allowing Niflheim to claim Galahd.[3] Nyx fought in the local Resistance against imperial oppression. His sister was killed, and he was saved by King Regis of Lucis. Seeking to repay his debt to the monarch, Nyx joined the Kingsglaive after moving to the Crown City, an elite unit of soldiers whose members are chosen for their aptitude for magic. He received training from Titus Drautos, who became the captain of the Kingsglaive, and came to view him as a mentor.

Alongside his fellow Glaives, Nyx defends the borders of Lucis from Niflheim and Tenebrae's forces. He disobeys Captain Drautos's order to retreat, and instead chooses to save Libertus, his childhood friend, from Cerberus, a powerful three-headed beast. As punishment Nyx is placed on guard duty upon his return to Insomnia, the crown city of Lucis.

Three days before a peace treaty is to be signed between King Regis of Lucis and Emperor Aldercapt of Niflheim, Nyx is relocated to the Citadel by Drautos. As mentioned in Final Fantasy XV Prologue Parting Ways, Drautos has Nyx drop Noctis off to his place as thanks for using his car. The men discuss the death of Crowe Altius, and the next day, Nyx gets into a heated argument with Libertus after seeing Crowe's corpse. That evening, Nyx attends a party celebrating the treaty-signing at Caelum Via and meets Princess Lunafreya. He passes a hairpin onto her he had received among Crowe's possessions, knowing giving it to Lunafreya had been part of Crowe's mission.

On the day the peace treaty is to be signed, Nyx discovers Lunafreya has been kidnapped and Drautos has mysteriously disappeared. He demands the Kingsglaive's deployment from King Regis, and leads his comrades on a mission aboard a Niflheim airship to rescue the princess after realizing Crowe's watch, now in his possession, keeps track of the hairpin. Nyx is betrayed by a majority of his fellow Glaives who disagree with the peace treaty terms and deem the king has abandoned them. Nyx frees Lunafreya and uses the airship to fly back to the Citadel with her. They witness the Wall fall as Niflheim begins its invasion, deploying daemons and magitek infantry to annihilate the city. Nyx and Lunafreya help a wounded King Regis escape Imperial General Glauca, who seeks the Ring of the Lucii, a ring that gives special powers to the past kings' chosen.

Nyx with King Regis and Luna.

At the end of a secret passageway, Nyx questions King Regis's decision to sacrifice Insomnia for Prince Noctis's continued safety. He agrees to protect Lunafreya, who is given the Ring of the Lucii, and flees with her after Regis is impaled by Glauca's blade.

As he and Lunafreya drive away from the Citadel, Nyx is contacted by Drautos and ordered to rendezvous with him in Section D of Insomnia. In the city plaza, he is attacked by a fellow Glaive Luche Lazarus and discovers through Libertus's intervention that Drautos is Glauca. To protect his friends, Nyx puts on the Ring of the Lucii and is granted its power in exchange for his life. After ordering Libertus to get Lunafreya somewhere safe, he gives her the ring to deliver it to Noctis. Nyx engages Glauca while wielding the power of the old kings. In the clash's aftermath, Nyx dies peacefully as he wishes Noctis a healthy rule, his body turning to ash.

As depicted in Final Fantasy XV: Comrades, Libertus still holds onto hope he will meet Nyx again. After the power of kings returns to the Glaives, Libertus migrates to Lestallum and leads the remains of the Kinsglaive in protecting the world in the king's absence. He writes a letter to Nyx about how daemons have done a number on Galahd, but he hopes they can route electricity there one day.

Nyx's corpse hanging above the throne.

Ten years after the world is plunged into darkness with the Starscourge, an illusory version of Nyx's corpse hangs in chains from the ceiling of the Citadel's throne room. Ardyn Izunia uses it to discourage Noctis. The corpse has white crystalline scarring, showing the damage Nyx sustained by using the Ring of the Lucii. A psychomancer in the city holds Nyx's weapons, and yields them to Noctis if defeated.

As an easter egg, Nyx's weapons can be obtained in Insomnia in Final Fantasy XV. If the player returns to the opening area of Insomnia and defeats a level 85 psychomancer, they get Ulric's Kukris. They are dagger-type weapons that Noctis and Ignis can use. Some players have found the kukris simply lying on the ground without the psychomancer spawning, as recently as Royal Edition version 1.24 with an end-game save rather than Chapter Select.[4]

Nyx's theme color is blue to complement Regis's more mature and noble purple. He has animalistic elements to his character design to show he is an immigrant and from a different culture. He is 32 because the development team wanted him to be 20 years old 12 years ago (when the 8-year-old Noctis visited Tenebrae). Kingsglaive was established 15 years ago, so Nyx is a veteran. Kingsglaive members were designed to be older than the player party from Final Fantasy XV to show the world of Eos from the eyes of experienced people who have learned the world.[2]

The likeness of Johan Akan, a French model, is used to portray Nyx.[5] Neil Newbon is the character's motion capture artist.[6]

The scene where Nyx talks with Luna on the eve of the signing ceremony is adapted from the original opening for Final Fantasy Versus XIII, complete with the painting of the goddess Etro on the background.

Square Enix showed a tech demo of Nyx at Nvidia's GPU Technology Conference in May 2017. With top-of-line PC hardware from Nvidia (the server-grade Tesla V100), Square Enix pulled character models and textures from the Kingsglaive film and displayed them in real time using Luminous Studio Pro, the engine that powers Final Fantasy XV. Kingsglaive features modeling of hair, skin, leather, fur, and lighting that no PC on the market in 2017 can display (at least in 4K).

Even with the 12 teraflops of power behind [Kingsglaive], all we can get this character to do is stand in this ready position. To get him to start walking around, extra processing power is required. It wouldn't even work in this environment. Our expectation is that until you've got maybe two or three times the processing power of 12 teraflops, you won't be able to have characters of that quality and level of detail moving around freely in a game environment.

Nyx appears as a summonable vision and optional playable character. A 5-7★ Rare Summon available since the event Battle at the Borders, Nyx's job is listed as Kingsglaive, and his role is Physical Damage. His Trust Master reward is the passive ability materia Guard of the Future, and his Super Trust Master reward is one of his daggers, simply called Nyx's Dagger and which has an Attack power of 158.

After losing his younger sister and his hometown of Galahd to the tumult of the war between Lucis and Niflheim, Nyx seeks refuge in the Crown City at a young age. Saved by King Regis, Nyx has felt indebted to him ever since, and is currently a member of the elite force of soldiers under the king's command called the Kingsglaive. He blames his own inadequacies for not being able to save his sister, and this has left him emotionally scarred. Despite this, he is an optimist, and is continuously contemplating how he should best lead his life moving forward, looking always toward the future. His combat skills as a member of the Kingsglaive are top-class, earning him the nickname 'Hero.' Although he is not a part of the royal family, he is able to make use of their magic, mastering a form of warping that enables him to teleport wherever he launches his weapons.

As an easter egg, Nyx's daggers can be obtained in Chapter 14 in Final Fantasy XV. Noctis also uses them in Omen when he fights Niflheim troops on a bridge. Artwork of one of the Nyx's daggers also appears in a loading screen for Final Fantasy XV: Comrades.